HAMEG. OSCILLOSCOPE HM Specification. TLOPL HH4E. Vertical Deflection (Y). Bandwidth: of both channels. DC MHz (-3dB), DC MHz (- 6dB). OSCILLOSCOPE HM I Overscanning I Bandwidth DC MHz H Delayed Sweep H LPS Triggering to 40 MHz The HM demonstrates the. Hameg HM Oscilloscope problem. «on: January 16, , pm». Hey guys. The other day i went to the old stuff market and saw this oscilloscope.

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In “search” position, the LED will blink. Then the associated attenuator switch has to be set to a greater deflection coefficient. The power plug-in unit at the rear contains the mains fuse, which is interchangeable for the dif- ferent mains voltages.

A com- pensated 2: For the measurement of the high voltage ripple you need a probe capable to withstand V e. In some cases an extremely cold oscilloscope about two hours should be allowed before putting the instrument into operation.

To obtain a display the following procedure should be adopted. This oc- curs, for example, with burst signals. This unit contains the three-pin power connector. With dual mode it is the same.

It should be noted that damage to the instru- ment will occur if higher voltages than TTL 5Vpp are applied to this input. The probe can be connected to the test circuit by a removable sprung hook, and an integral ground lead with an insulated crocodile clip.

In this mode the os- cilloscope input hqmeg grounded. The checking and correction of the DC-balance for the amplifiers should be carried out as already described in the Operating Instructions. Special model for HM oscilloscope on request.

Haeg HM41 2 should trigger internally on sinusoidal signals up to 40MHz perfectly at a display height of approx. In the alternate mode the unblanking pulse from the sweep generator is used as the control signal, while a hamrg MHz signal is used in the chop mode.

If not, it must be corrected with the trimming pot for sweep amplitude see Adjusting Plan. The fuse holder should then be plugged in again in the selected position. The delay fine control should now be adjusted so that the display starts just prior to the short time interval to be investigated.


Under these conditions no variations should be detected on the display in either the vertical or horizontal axis. In haeg to obtain a stable display the timebase must be triggered synchronously with the test signal. Fixed resistor 1 Megohm. Trouble-Shooting the Instrument For this job, there will be needed at least an isolating variable mains transformer protection classification IIa signal generator, an adequate precise multi- meter, and, if possible, an oscilloscope.

For both of these operating modes the vertical posi- tion of the trace depends on the setting of the “Y-POS. One side of this parallel circuit is connected directly to the input connector of the vertical amplifier and the other side is connected 42 the generator, if possible via a low-capacitance coaxial cable. As the HM is a fully hame oscilloscope the heat generation of the instrument is very low, thus ensuring long term reliable operation.

Therefore, the calibration of the X-signal during X-Y h is determined by the setting of the Channel II input attenuator and fine control. It must be remembered that the 50Q through-termination will only dissipate a maximum of 2 watts.

Power consumption; 36 W approx. However, when in- vestigating signals at frame rate, the “TV” pushbut- ton must be depressed. The method employed is as follows. The trace position should then vary in accordance with the deflection coefficient set.

In this case, DC operation is to be preferred if the signal voltage is not superim- posed on a high DC voltage level. Incidental touches with dangerous voltage potentials are then unlikely.

If a trace is not visible in either of these modes the overscanning LED’s will indicate the position of the trace. On dual channel operation the internal trigger signal may be selected from either Channel I or Channel II, however, it is preferable to trigger from the less com- plicated signal. To obtain a stably triggered display in these cases, it may be necessary to use the timebase variable control or the sweep delay facility. A few degrees of misalignment can be corrected by a preset resistor accessible through an opening on the front panel marked “TR”.


However, when square or pulse- shaped signals are displayed it must be remembered that their harmonic content will also be transmitted. The final vertical amplifier incorporates the Overscanning facility. If a X 1 0 at- tenuator probe e.

Oscilloscope HM412

However, if for example only the residual ripple of a high voltage is to be displayed on the oscilloscope, a normal XI 0 probe is sufficient. In view of this, accurate evalua- tion of such signals with the HM41 2 is only possible up to a maximum repetition rate of 2MHz.

The display may not shift horizontally hamg a change of the trigger coupling from “AC” to “DC” with a sine-wave signal without DC offset.

This comment also applies to the ground leads on attenuator probes which ideally should be as short and as thick as possible.

If a smaller display is acceptable it is possible to investigate signals up to about 40 MHz. This mode is not suitable for the display of very low frequency signals, as the trace will appear to flicker or jump.

In this case, an appropriate high voltage capacitor ap- prox. The basic requirement for this is a correct DC-balance align- ment on the input of the vertical amplifier see Operating Instructions.

Oszilloskop HM Equipment HAMEG GmbH, Frankfurt, build

The “AC” position can be used for the investigation of most uncomplicated waveforms, while “DC” coupling pushbutton depressed is recommended when very low frequen- cy signals are being investigated. Focus the horizontal tops of the square-wave signal at normal intensity, then check the sharpness of the vertical edges. Only one LED will be on, if both traces are in the same area out of the raster.

If this is so, it should be released. Trigger System Modes; automatic or variable trigger level. Such small misalignments depending on the oscilloscope’s position in the workroom can be easily corrected by the adjustment of the variable resistor for trace rotation.